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J Hazard Mater

Title:		Carbon quantum dots-TiO(2) nanocomposite as an efficient photocatalyst for the photodegradation of aromatic ring-containing mixed VOCs: An experimental and DFT studies of adsorption and electronic structure of the interface
Author(s):		Mahmood A; Shi G; Wang Z; Rao Z; Xiao W; Xie X; Sun J;
Address:		"Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China. Electronic address: amkhan036@yahoo.com. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China. Electronic address: jingsun@mail.sic.ac.cn"
Journal Title:		J Hazard Mater
Year:		2021
Volume:		20200708
Issue:
Page Number:		123402 -
DOI:		10.1016/j.jhazmat.2020.123402
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"In this work, we have developed and optimized TiO(2) nanoparticles decorated with carbon quantum dots to examine its potential use in the photocatalytic oxidation of aromatic ring containing gas-phase mixed volatile organic compounds, e.g., benzene, toluene, and p-xylene. Carbon quantum dots decorated TiO(2) demonstrated good photodegradation efficiency in contrast to pure TiO(2) under UV-vis light illumination. For example, with 0.5 wt% carbon quantum dots decorated on TiO(2), 64 % of the mixed volatile organic compounds were photodegraded, while pure TiO(2) only exhibited 44 % of the photodegradation efficiency. Also, the carbon quantum dots (0.5 wt%)/TiO(2) nanocomposite demonstrated considerable photocatalytic activity within the visible region. On the other hand, pure TiO(2) remained inactive within the visible region. The density functional theory study of the carbon quantum dots/TiO(2) interface revealed that C 2p states of carbon quantum dots incorporated new energy states around the Fermi level near the lowest conduction band. This might be accountable for the improved charge separation process and better conductivity of the photogenerated electrons. The improved photocatalytic performance of the carbon quantum dots/TiO(2) nanocomposites can be attributed to good light harvesting within the UV-vis region, charge separation, and adsorption capability"
Keywords:		Carbon quantum dots Oxide semiconductor materials Photocatalytic oxidation Volatile organic compounds;
Notes:		"PubMed-not-MEDLINEMahmood, Asad Shi, Gansheng Wang, Zhuang Rao, Zepeng Xiao, Wang Xie, Xiaofeng Sun, Jing eng Netherlands 2020/08/09 J Hazard Mater. 2021 Jan 5; 401:123402. doi: 10.1016/j.jhazmat.2020.123402. Epub 2020 Jul 8"